如何重用函数中的参数？

def my_function(param):
    local_var = param
    # 在函数中重复使用局部变量
    result1 = local_var + 1
    result2 = local_var * 2
    return result1, result2

def my_function(param1, param2=0):
    result1 = param1 + param2
    result2 = param1 * param2
    return result1, result2

def my_function(*args):
    result = 0
    for arg in args:
        result += arg
    return result